In another sign that the competition between expensive virtual reality headsets will be waged as a platform war, ads for the PlayStation VR releases tied to the Batman Arkham and Resident Evil series indicate they will be exclusive to Sony’s VR offering for quite some time.

An ad for Arkham VR, which is a $20 standalone game made by lead Arkham studio Rocksteady, complete with Mark Hamill reprising his role as the Joker, indicates that it is PSVR-only until the end of March 2017.

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An ad for Resident Evil VR, which is an option to play the entirety of the upcoming Resident Evil 7 in virtual reality via PSVR, indicates that option will be exclusive to Sony virtual reality for 12 months. RE7 comes out in January.

Both ads appeared on PlayStation’s Facebook page, according to a person who grabbed them and posted them to the NeoGAF forum.

VR exclusivity has been a touchy subject given the $400-and-up expense of the Oculus Rift, Valve-backed Vive and PS VR headsets. VR games released to the Steam marketplace tend to work with Vive and the Rift. Many of the release on Steam tend to be rougher-edged early access, indie games. The Facebook-owned Oculus has also published and backed numerous bigger-budget VR that are programmed to only run on the Rift. Sony’s VR headset launches on October 13, and it will claim several releases not announced for either of the other two headset, including games backed by major publishers who’ve yet to throw much or any support behind games for the other two headsets. EA, Activision, Warner Bros. and Capcom all have PSVR releases slated but nothing out yet for Rift or Vive. Ubisoft’s upcoming VR games are announced for multiple VR devices.

The Arkham and Resident Evil ads are an indicator of how long those releases will stick to Sony and reinforce the idea that if you get one VR headset you’re in some way going to be cut off from being able to buy and play all the VR games available.

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We’ve reached out to the PR firms for both games as well as for other major PlayStation VR titles to clarify any further details about the games’ exclusivity. We’ll have full coverage of PS VR and its line-up in the coming weeks,